By considering characteristics of rural power system, this study presents an optimal method to estimate wind speed and install Wind Power Turbine (WPT). Entire installation procedure is composed by selecting appropriate buses and verifying the power system after installing WPT. Two innovative indices such as the Power Index in Crisis Time (PICT) and the Endurance Index of Crisis Hours (EICH)) are developed and applied for determining the reliability level of target buses for installing WPT. The stability and reliability of formed hybrid power system are verified by the references of frequency and voltage. Result from this study was applied for a rural power system containing hydro power generation.